I can’t remember where I read it, probably on here somewhere. But what I have been told is the Nuchal hump develops from a few different factors and one of them is competition of other fish. My understanding of this is that when there are other fish competing for food or slightly endangering their lives it causes their hormones to rage. But I may be entirely off on that.Interesting pic of a smaller temensis with hump on his head. Not my pic. Just got it off of instagram. Why do y'all think wild temensis in lakes and rivers develope a hump at smaller young ages while you don't see this in the hobby?